Improvement in oscillating chairs



UNITED STATES PATENT OFFICE.

WILLIAM T. DOREMUS, OF YORK, N. Y.

IMPROVEMENT IN OSCILLATING CHAIRS.

Specification forming part of Letters Patent No. 215,337, dated May 13,1879; application filed February 20, 1879.

To all whom it may concern:

Be it known that I, WILLIAM T. DOREMUS, of the city, county, and Stateof New York, have invented a new and useful Improvement in OscillatingChairs, of which the following is a specification. I

Figure'l is a side view of a part of a chair to which my improvement hasbeen applied. Fig. 2 is a vertical cross-section of the same, takenthrough the line 00 m, Fig. 3, part being broken'away to show theconstruction. Fig. 3 is a front view, partly in section, through theline y y, Fig. 2.

Similar letters of reference indicate corresponding parts.

The object of this invention is to improve the construction of the chairfor which Letters Patent No. 161,671 were granted to me April 6, 1875,in such-a way that the amount or degree of elasticity of the rubbersprings may be readily regulated, that the tilt of the chair may bereadily adjusted, and that the bolts may be protected from lateralstrain when the chair is oscillated.

The invention consists in the combination of the upper plate, havinginclined cross-heads formed upon its ends, the four bolts, and theirrubber blocks or washers, with the supportingplate, the rubber blocks,and the curved straps; in the offsets formed upon the two plates, toserve as stops to limit the forward movement of the chair; in theflanges or lugs formed upon the rear edge of the lower plate, to receivethe rear edge of the upper plate and serve as stops to limit therearward movement of the chair; and in the upward projections formedupon the outer ends of the arms of the lower plate, to prevent anylateral movement of the bearing-blocks and straps, as hereinafter fullydescribed.

A represents the cap-plate, that receives the legs of the chair, and inwhich is formed the long nut for the pivot-screw B. The upper end of thescrew B is attached to or formed upon the rear their outer ends haveupward projections or stops 0 formed upon them, as shown in Fig.

The end parts of the straps D are curved upward, and their ends are bentoutward and are attached to the seat-frame E. Upon the edges of themiddle parts of the straps D, di-

I rectly over the bearing-blocks d, are formed upwardly-projectingflanges 01 to form a seat for the triangular wedge or other shaped rubber blocks F. Upon the upper sides of the rubber blocks F rest theinclined cross-heads of the plate G, which cross-heads havedownwardly-proj ecting flanges g formed upon their upper forward ends,to prevent the rubber blocks F from working forward.

The plate G is made with an oflset, g corresponding with the offset 0 ofthe plate 0.

H are four bolts, which are passed through the forward and rear parts ofthe two plates 0 G, and have nuts screwed upon their forward ends. Withthis construction, by tightening or loosening the nuts of the four boltsH, the amount or degree of elasticity of the rubber blocks F will beincreased or diminished, as may be required, and by loosening ortightening the two forward bolts, and tightening or loosening the tworear bolts accordingly, the chair will be tilted back or forward, as maybe desired, to meet the wishes of the buyer, or to compensate for thepacking of the rubber.

Rubber blocks or washers I are placed upon the bolts H between theplates 0 G to keep the parts firm and snug, and prevent any noise orrattling when the chair is in use.

Upon the rear edge of the plate 0 are formed upwardly-proj ecting lugsor flanges 0 to serve as stops for the rear edge of the plate G tostrike against when the chair is tilted backward, to relieve the boltsHfrom the side strain that would otherwise come upon them.

The shoulders of the offsets c g of the plates 0 G serve as stops whenthe chair is tilted forward to relieve the bolts H from side strain. Theend shoulders of the plates 0 G, the projection c of the. arms a, andthe flanges d of the strapsD keep everything in place laterally. Withthis construction the chair has a firm rigid support, and at the sametime an elastic oscillation or forward and backward movement, whichmovement may be made more or less free by adjusting the nuts of thebolts H.

Having thus fully described my invention, I claim as new and desire tosecure by Letters Patent 1. The combination of the plate G, havinginclined flanged cross-heads g and offsets g, the bolts H, and theirrubber washers I, with the supporting-plate (J, the rubber blocks F, andthe curved straps D, substantially as herein shown and described.

2.. The supporting-plate O,provided with the screw B, the ofl'set 0 thearms 0, and the,

WILLIAM T. DOREMUS.

Witnesses:

JAMES T. GRAHAM, G. SEDGWICK.

